Improvement in ventilators



- F. D. CHASE.

Ventilator. No. 38,946. Patented June 23. 1863.

UNITED STATES PATENT OFFICE. I

FREDERIO D. CHASE, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN VENTILATORS.

Specification forming part of Letters Patent No. 38,946, dated June 23,1863.

To all whom it may concern.-

Be it known that I, FREDERIC D. CHASE, a resident of Boston, in thecounty of Suffolk and State of Massachusetts, have invented an ImprovedDeck, Floor, or Roof Guard and Ventilator; and I do hereby declare thesame to be fully described in the following specification, andrepresented in the accompanying drawings, of which Figure 1 is a topview, Fig. 2 a bottom view, Fig. 3 a side elevation, and Fig. 4 avertical section, of it.

The said guard and ventilator is not only for the purpose of ventilatingan apirtment of a building, or the hold. or cabin ot' a vessel, but istoprotect the deck of such vessel or the roof or floor of the buildingthrough which a smoke-pipe may be run from being set on fire or burnedby heat radiated from such pipe.

In the drawings, A and B are two flat circular annuli, the upper onebeing fastened to and made to encompass a pipe, 0. A hollow conicfrustum, D, is fixed at its larger end upon the lower plate, B, and atits upper or smaller end or lesser base (which is open) it receives thepipe or tube 0. This tube 0 should be so adapted to the opening at thetop of the portion D as to fit closely to its periphery and be capableof being slid vertically within the same, in order to adjust thedistance of the plate A from the plate B, the same being to enable theapparatus to be adapted to the deck of a vessel. As the decks ofdifferent vessels may vary more or less in thickness, the two plates Aand B, by which the apparatus is to be secured to a deck, (one platebeing fastened to the upper and the other to the lower surface of thedeck,) can thus be brought into proper contact with a deck, provided itmay have a thickness which may be less than the depth of the conicalfrustum, and not greater than such depth and the extent of projection ofthe tube 0 below the plate A. A smoke=pipe, E, extends up through theplate B and into the tube 0, there being an air-space, a, arrangedbetween the pipes E and O, which are concentric with each other. Thelower end of this air-space is open, while the upper part of it iscovered or capped by an annular rain-guard, F, between which and the topof the smoke-pipe E there is an annular opening, Z1, for discharge ofair from the space a into a column of smoke while flowing through thepipe E and out of its upper end. The interior of the conic frustum Dforms an air-chamber or mouth to the passage on, the bottom of suchchamber having a series of openings, 0 c a, which are provided with aregister, H, for closing them, (more or less,) as circumstances mayrequire. The

tube 0 is surmounted by a chimney or flue be, and to serve as a means ofdischarging its.

smoke. The heat radiated from the pipe E will induce a current of air toflow through the openings 0 c and into the chamber G, from whence itwill pass up through the passage (1 and through the annular opening I),and into the pipe E and cap I, from whence it will be discharged withthe smoke. Thiscurrent of air will not only produce ventilation of theapartment below the apparatus, but will serve to carry off the heatradiated from the external surface of the pipe E, and thus will preventthe said pipe from setting fire to or ch arring the wood-work of thedeck or floor or root, within which the parts G and D may be situated.The rim-cap F operates to prevent any rain or snow from passing into theupper part of the passage a during a storm, and while the apparatus maybe in use.

I claim-- 1. In the above-described deck guard and ventilator, thecombination of the annular rain-cap F and air-opening b withthesmokepipe E, the ventilating-passage a, and its airreceiver G,provided with inlets and a register, as specified.

2. The combination of the cap-plate A with the air-receiver G, itssmoke-pipe E and fastening-plate B, by means of the adjustable pipe 0,applied to and so as to be capable of sliding into the frustum D, andmade to circumscribe the smoke-pipe, substantially as and for thepurposes hereinbefore specified.

FREDERIG D. CHASE.

Witnesses:

R. H. EDDY, F. P. HALE.

